I usuaally ask my clients on the receiving end how they want me to declare it. I work with collectors, and anything I ship isn't usually their first overseas acquisition.
I have used 'Camping tool' with reservation. On an exotic Jose deBraga piece it was called a 'Cosplay fantasy item'.
I prefer 'dressy utility display knife with decorative leather sheath' I often undervalue the knife to not raise eyebrows, but I defer to the client's wishes (usually that's what they ask.)
My fingers are ALWAYS crossed on international shipments. I shipped an important box via FedEx to China for $160 and it arrived in 3 days. When I use USPS for $60 it takes a week or more. There are other lower cost options via USPS but time and security has value.
PayPal is flawless, but you will get zinged more on fees. I have to add more than a US fee on my international work because of all the extra time and angst. Only fair.